there are three questions.
1.Given that cos Ѳ = (1/2) and 270° < Ѳ < 360° , without using a calculator find the value of
(cos Ѳ – sin Ѳ)/(tan Ѳ+ sin Ѳ). Leave your answer as single fraction. Remain the surds as surds if there are surds in your answer.
2.Given that cos A = (1/2) and that cos A and sin A have the same sign, find the value of sin (–A) and of tan A.
3.Given that tan A = –(5/12) and that tan A and cos A have opposite signs, find the value of cos A and of cos [(∏/2)–A].